Question

What will be the ratio of temperatures of sun and moon if the wavelengths of their maximum emission radiations rates are 140 Å and 4200 Å respectively

• A. 1 : 30
• B. 30 : 1
• C. 42 : 14
• D. 14 : 42

Answer 1

Answer: (B)

30 : 1

Answer 2

$\frac { T _ { 1 } } { T _ { 2 } } = \frac { \lambda _ { m _ { 2 } } } { \lambda _ { m _ { 1 } } } = \frac { 4200 } { 140 } = \frac { 30 } { 1 }$